CN116375473A - 氟化镁基复合中子慢化材料及其制备方法 - Google Patents
氟化镁基复合中子慢化材料及其制备方法 Download PDFInfo
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- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 title claims abstract description 61
- 229910001635 magnesium fluoride Inorganic materials 0.000 title claims abstract description 61
- 239000000463 material Substances 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 8
- PQXKHYXIUOZZFA-UHFFFAOYSA-M lithium fluoride Chemical compound [Li+].[F-] PQXKHYXIUOZZFA-UHFFFAOYSA-M 0.000 claims abstract description 66
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000005245 sintering Methods 0.000 claims abstract description 21
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 19
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 19
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 claims abstract description 15
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 17
- 238000007731 hot pressing Methods 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 4
- 239000011812 mixed powder Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 206010028980 Neoplasm Diseases 0.000 description 6
- 201000011510 cancer Diseases 0.000 description 6
- 210000004027 cell Anatomy 0.000 description 6
- 239000000306 component Substances 0.000 description 5
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- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001959 radiotherapy Methods 0.000 description 1
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Abstract
本发明公开了一种氟化镁基复合中子慢化材料及其制备方法,由以下组分经热压烧结制备而成:97.5‑99.5份氟化镁,0.5‑2份氟化锂;或,氟化镁、氟化钙、铝粉和氟化锂,其中,氟化镁与氟化钙、铝粉和氟化锂的三者质量和之比为:50‑80:20‑50;氟化钙、铝粉和氟化锂的质量比为30‑35:64‑69:1;或,氟化镁、氟化铝、铝粉和氟化锂,其中,氟化镁与氟化铝、铝粉和氟化锂的三者质量和之比为:50‑80:20‑50;氟化铝、铝粉和氟化锂的质量比为30‑35:64‑69:1;或,60‑90份氟化镁,5‑40份氟化钙;或,60‑90份氟化镁,5‑40份氟化铝。
Description
技术领域
本发明属于材料制备领域,涉及一种氟化镁基复合中子慢化材料及其制备方法。
背景技术
这里的陈述仅提供与本发明相关的背景技术,而不必然地构成现有技术。
硼中子俘获治疗技术是通过在肿瘤细胞内引发核反应产生高传能线密度粒子来杀死癌细胞的一种新型靶向放疗。主要是在人体内通过注射与癌细胞有很强亲和力的含10B化合物,并迅速聚集于癌细胞内,然后用一种超热中子射线照射,中子与进入癌细胞内的10B能产生很强的核反应,释放出一种杀伤力极强的射线,从而达到从癌细胞内部爆破癌细胞的效果。中子俘获治疗装置中的中子源需经过一个能量慢化整形的过程,获得治疗中子束,才能应用于中子俘获治疗。因此,从中子源到治疗中子束之间的慢化体是该治疗装置的核心部件之一。
高致密度的氟化镁(MgF2)烧结体适合于质子能量<4MeV的质子加速器装置,而氟化铝和氟化钙烧结体更适合于质子能量>4MeV的质子加速器装置,但是对于质子能量有波动的质子加速器难以匹配合适的慢化体,进而难以获得适于治疗的中子束。
发明内容
针对现有技术存在的不足,本发明的目的是提供一种氟化镁基复合中子慢化材料及其制备方法。制备的慢化材料适应于更宽质子能量范围的加速器中子俘获治疗设备的中子慢化体。
为了实现上述目的,本发明是通过如下的技术方案来实现:
第一方面,本发明提供一种氟化镁基复合中子慢化材料,由以下组分经热压烧结制备而成:
97.5-99.5份氟化镁,0.5-2份氟化锂;
或,氟化镁、氟化铝、铝粉和氟化锂,其中,氟化镁与氟化铝、铝粉和氟化锂的三者质量和之比为:50-80:20-50;氟化铝、铝粉和氟化锂的质量比为30-35:64-69:1;
或,氟化镁、氟化钙、铝粉和氟化锂,其中,氟化镁与氟化钙、铝粉和氟化锂的三者质量和之比为:50-80:20-50;氟化钙、铝粉和氟化锂的质量比为30-35:64-69:1;
或,60-90份氟化镁,5-40份氟化钙;
或,60-90份氟化镁,5-40份氟化铝。
针对氟化镁和氟化锂、氟化镁和氟化铝、氟化镁和氟化钙的材料组合,氟化锂的加入一方面,促进氟化镁的烧结致密化,容易获得高致密的慢化体;另一方面,氟化锂成分对中子慢化也有一定的作用。
针对氟化镁、氟化铝、铝粉和氟化锂的材料组合,由氟化铝、铝粉和氟化锂形成的复合慢化体适合于质子能量大于4MeV的加速器装置,氟化镁慢化体适合于质子能量小于4MeV的加速器装置,而两者的复合会更有利于质子能量在4MeV附近的加速器装置,而且对于质子能量波动的情况慢化效果更好。
针对氟化镁、氟化钙、铝粉和氟化锂的材料组合,由氟化钙、铝粉和氟化锂形成的复合慢化体适合于质子能量大于4MeV的加速器装置,氟化镁慢化体适合于质子能量小于4MeV的加速器装置,而两者的复合会更有利于质子能量在4MeV附近的加速器装置,而且对于质子能量波动的情况慢化效果更好。
在一些实施例中,所述氟化镁的纯度大于99.5%。
优选的,所述氟化锂的纯度大于99.5%。
第二方面,本发明提供所述氟化镁基复合中子慢化材料的制备方法,包括如下步骤:
将各组分按比例混合均匀,制得混合粉体;
将混合粉体装入橡胶模具中,等静压成型;
修正坯体,将其进行热压烧结;
热压烧结完毕后,烧结体经加工得到所需慢化体材料。
在一些实施例中,当组分中含有铝粉时,将各组分按比例均匀混合的过程中,充入氩气进行保护以防止铝粉氧化,混合时间为20-60min。
在一些实施例中,等静压成型的压强为90-120MPa。
在一些实施例中,热压烧结的温度为800-1200℃,保温0.5-2h。
优选的,热压烧结的温度为900-1000℃,保温0.5-1.5h。
优选的,热压烧结的热压压力为25-35MPa。
上述本发明的一种或多种实施例取得的有益效果如下:
结合了纯氟化镁和氟化铝以及氟化钙慢化体的优点,更适合于质子能量有波动的质子加速器硼中子俘获治疗装置。
具体实施方式
应该指出,以下详细说明都是例示性的,旨在对本发明提供进一步的说明。除非另有指明,本发明使用的所有技术和科学术语具有与本发明所属技术领域的普通技术人员通常理解的相同含义。
下面结合实施例对本发明作进一步说明。
实施例1
本发明的氟化镁基复合材料中子慢化体具有致密度高,中子慢化效率高的特点。制备方法包括以下步骤:
⑴配料与混料:将99.5份纯度大于99.5%的氟化镁粉,0.5份纯度大于99.5%的的氟化锂粉,放入混料器中,充氩气保护,混合30min,得到混合料。
⑵压坯:将混合料装入橡胶模具中,等静压压制,等静压压强100MPa,坯体经过加工,得到适合于热压烧结的块体。
⑶热压烧结:将压块装入石墨衬套的C/C模具中,在热压炉中热压烧结。热压烧结过程中,抽真空,以5℃/min的升温速度加热到950℃,保温1h,热压压力30MPa。自然冷却,得氟化镁烧结体。
⑷加工:采用现有通用加工设备和手段,将氟化镁烧结体进行磨削、切割等加工,得到组合部件,组合成为中子慢化体。
该实施例制得的氟化镁烧结体的尺寸为直径500mm,高度200mm,相对密度98%,弯曲强度为20MPa,维氏硬度220HV。
特别适合于质子能量<4MeV的质子加速器装置。
实施例2
与实施例1的区别在于:
1)配料:60份纯度大于99.5%的氟化镁、28份纯度大于99.5%的氟化铝、11份铝粉,1份纯度大于99.5%的氟化锂粉粉。
2)热压烧结温度为800℃。
烧结体的抗弯强度为18MPa,维氏硬度210HV。
更适合于质子能量2-8MeV范围的质子加速器装置。
实施例3
与实施例2的区别在于:
1)配料为:60份纯度大于99.5%的氟化镁、28份纯度大于99.5%的氟化钙、11份铝粉,1份纯度大于99.5%的氟化锂粉粉。
2)热压烧结温度为850℃。
烧结体的抗弯强度为22MPa,维氏硬度220HV。
更适合于质子能量3-10MeV范围的质子加速器装置。
实施例4
与实施例2的区别在于:
1)配料:70份纯度大于99.5%的氟化镁与30份纯度大于99.5%的氟化钙。
2)热压烧结温度为1000℃。
烧结体的抗弯强度为24MPa,维氏硬度260HV。
更适合于质子能量2-7MeV范围的质子加速器装置。
实施例5
与实施例4的区别在于:
1)配料:70份纯度大于99.5%的氟化镁与30份纯度大于99.5%的氟化铝。
2)热压烧结温度为900℃。
烧结体的抗弯强度为23MPa,维氏硬度215HV。
更适合于质子能量2-6MeV范围的质子加速器装置。
以上所述仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (10)
1.一种氟化镁基复合中子慢化材料,其特征在于:由以下组分经热压烧结制备而成:
97.5-99.5份氟化镁,0.5-2份氟化锂;
或,氟化镁、氟化钙、铝粉和氟化锂,其中,氟化镁与氟化钙、铝粉和氟化锂的三者质量和之比为:50-80:20-50;氟化钙、铝粉和氟化锂的质量比为30-35:64-69:1;
或,氟化镁、氟化铝、铝粉和氟化锂,其中,氟化镁与氟化铝、铝粉和氟化锂的三者质量和之比为:50-80:20-50;氟化铝、铝粉和氟化锂的质量比为30-35:64-69:1;
或,60-90份氟化镁,5-40份氟化钙;
或,60-90份氟化镁,5-40份氟化铝。
2.根据权利要求1所述的氟化镁基复合中子慢化材料,其特征在于:所述氟化镁的纯度大于99.5%。
3.根据权利要求1所述的氟化镁基复合中子慢化材料,其特征在于:所述氟化锂的纯度大于99.5%。
4.权利要求1-3任一所述氟化镁基复合中子慢化材料的制备方法,其特征在于:包括如下步骤:
将各组分按比例混合均匀,制得混合粉体;
将混合粉体装入橡胶模具中,等静压成型;
修正坯体,将其进行热压烧结;
热压烧结完毕后,烧结体经加工得到所需慢化体材料。
5.根据权利要求4所述的氟化镁基复合中子慢化材料的制备方法,其特征在于:当组分中含有铝粉时,将各组分按比例均匀混合的过程中,充入氩气进行保护,混合时间为20-60min。
6.根据权利要求4所述的氟化镁基复合中子慢化材料的制备方法,其特征在于:等静压成型的压强为90-120MPa。
7.根据权利要求6所述的氟化镁基复合中子慢化材料的制备方法,其特征在于:等静压成型的压强为100-110MPa。
8.根据权利要求4所述的氟化镁基复合中子慢化材料的制备方法,其特征在于:热压烧结的温度为800-1200℃,保温0.5-2h。
9.根据权利要求8所述的氟化镁基复合中子慢化材料的制备方法,其特征在于:热压烧结的温度为900-1000℃,保温0.5-1.5h。
10.根据权利要求9所述的氟化镁基复合中子慢化材料的制备方法,其特征在于:热压烧结的热压压力为25-35MPa。
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